regex/demo/snippets/snip4.cpp

/*
 *
 * Copyright (c) 1998-2000
 * Dr John Maddock
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Dr John Maddock makes no representations
 * about the suitability of this software for any purpose.
 * It is provided "as is" without express or implied warranty.
 *
 */

 /*
  *   LOCATION:    see http://www.boost.org for most recent version.
  *   FILE         snip4.cpp
  *   VERSION      3.00
  *   DESCRIPTION: regex_merge example:
  *                converts a C++ file to syntax highlighted HTML.
  */

#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <iterator>
#include <boost/regex.hpp>
#include <fstream>
#include <iostream>

// purpose:
// takes the contents of a file and transform to
// syntax highlighted code in html format

boost::regex e1, e2;
extern const char* expression_text;
extern const char* format_string;
extern const char* pre_expression;
extern const char* pre_format;
extern const char* header_text;
extern const char* footer_text;

void load_file(std::string& s, std::istream& is)
{
   s.erase();
   s.reserve(is.rdbuf()->in_avail());
   char c;
   while(is.get(c))
   {
      if(s.capacity() == s.size())
         s.reserve(s.capacity() * 3);
      s.append(1, c);
   }
}

int main(int argc, const char** argv)
{
   e1.set_expression(expression_text);
   e2.set_expression(pre_expression);
   for(int i = 1; i < argc; ++i)
   {
      std::cout << "Processing file " << argv[i] << std::endl;
      std::ifstream fs(argv[i]);
      std::string in;
      load_file(in, fs);
      std::string out_name(std::string(argv[i]) + std::string(".htm"));
      std::ofstream os(out_name.c_str());
      os << header_text;
      // strip '<' and '>' first by outputting to a
      // temporary string stream
      std::ostringstream t(std::ios::out | std::ios::binary);
      std::ostream_iterator<char, char> oi(t);
      regex_merge(oi, in.begin(), in.end(), e2, pre_format);
      // then output to final output stream
      // adding syntax highlighting:
      std::string s(t.str());
      std::ostream_iterator<char, char> out(os);
      regex_merge(out, s.begin(), s.end(), e1, format_string);
      os << footer_text;
   }
   return 0;
}

extern const char* pre_expression = "(<)|(>)|\\r";
extern const char* pre_format = "(?1&lt;)(?2&gt;)";


const char* expression_text = // preprocessor directives: index 1
                              "(^[[:blank:]]*#([^\\n]*\\\\[[:space:]]+)*[^\\n]*)|"
                              // comment: index 3
                              "(//[^\\n]*|/\\*([^*]|\\*+[^*/])*\\*+/)|"
                              // literals: index 5
                              "\\<([+-]?((0x[[:xdigit:]]+)|(([[:digit:]]*\\.)?[[:digit:]]+([eE][+-]?[[:digit:]]+)?))u?((int(8|16|32|64))|L)?)\\>|"
                              // string literals: index 14
                              "('([^\\\\']|\\\\.)*'|\"([^\\\\\"]|\\\\.)*\")|"
                              // keywords: index 17
                              "\\<(__asm|__cdecl|__declspec|__export|__far16|__fastcall|__fortran|__import"
                              "|__pascal|__rtti|__stdcall|_asm|_cdecl|__except|_export|_far16|_fastcall"
                              "|__finally|_fortran|_import|_pascal|_stdcall|__thread|__try|asm|auto|bool"
                              "|break|case|catch|cdecl|char|class|const|const_cast|continue|default|delete"
                              "|do|double|dynamic_cast|else|enum|explicit|extern|false|float|for|friend|goto"
                              "|if|inline|int|long|mutable|namespace|new|operator|pascal|private|protected"
                              "|public|register|reinterpret_cast|return|short|signed|sizeof|static|static_cast"
                              "|struct|switch|template|this|throw|true|try|typedef|typeid|typename|union|unsigned"
                              "|using|virtual|void|volatile|wchar_t|while)\\>"
                              ;

const char* format_string = "(?1<font color=\"#008040\">$&</font>)"
                            "(?3<I><font color=\"#000080\">$&</font></I>)"
                            "(?5<font color=\"#0000A0\">$&</font>)"
                            "(?14<font color=\"#0000FF\">$&</font>)"
                            "(?17<B>$&</B>)";

const char* header_text = "<HTML>\n<HEAD>\n"
                          "<TITLE>Auto-generated html formated source</TITLE>\n"
                          "<META HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html; charset=windows-1252\">\n"
                          "</HEAD>\n"
                          "<BODY LINK=\"#0000ff\" VLINK=\"#800080\" BGCOLOR=\"#ffff99\">\n"
                          "<P> </P>\n<PRE>";

const char* footer_text = "</PRE>\n</BODY>\n\n";